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Old 05-29-2020, 06:20 PM
 
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What about this?

https://youtu.be/tPo98ysiwzs
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Old 05-29-2020, 06:32 PM
 
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Many better built kayaks have foam in the bow and stern. It adds stability to the shell. It may add a measure of safety if the kayak becomes swamped.

The best thing to do is buy a kayak with a capacity suited to your use instead of cobbling together something. A sit on top kayak might be a better fit. Compared to a sit in boat.
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Old 05-29-2020, 08:35 PM
 
Location: ATL -> HOU -> DAL -> ATL
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I don't think it's been directly stated yet but to oversimplify, buoyancy is related to volume of water displaced.
Absolutely massive cruise ships weighing tens of thousands of tons float because they displace a crap ton of water.
That's why adding "light" materials inside the kayak don't do anything. You aren't creating any additional displacement other than the additional weight (however light) pushing the kayak down further. You need something additional outside of the existing kayak shell. Some products may work decently well but I imagine it's gonna create a lot of extra drag.
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Old 05-30-2020, 01:14 AM
 
Location: Eugene, Oregon
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The only way you could add flotation capacity to a kayak that is riding on top of the water with a passenger, is to add one or two outrigger pontoons. These would slow you down, but would work to keep you from getting swamped or capsizing. Maybe you could find a good sea kayak, which tend to have more volume and flotation, than smaller ones made for river paddling.

Below is a link to a picture of one I designed and built, that has plenty of volume, but is still fast. It's 18 feet long. This angle gives a good view of the shape of its hull. In each end is a flotation plug made from resin, that is expanded to 6 times its normal volume, using a micro-balloon filler. They are tiny, hollow spheres of glass that expand the resin into a lightweight putty that hardens, but flows freely when you pour it into place.

https://live.staticflickr.com/65535/...2189779e_o.jpg
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Old 05-30-2020, 09:43 AM
 
Location: God's Gift to Mankind for flying anything
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Simply stated, the amount of water displaced is what determines the position of the kayak.

Adding items on the outside is relatively nothing compared to the original situation.
(How much more water would be displaced by a few pool noodles?)

So the best answer is above... get a bigger kayak!

Sure, you can add enclosed 55-gallon barrels on the sides, but how do you control the kayak?
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Old 05-30-2020, 01:24 PM
 
Location: Tucson Arizona
4,878 posts, read 2,213,144 times
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I suppose you could fill the hull with helium or hydrogen gas to make the boat lighter; they're both lighter than air. But the weight of whatever you use to hold the gas would offset some of the gain, probably resulting in very little gain. The gas would leak out of latex or mylar party balloons in a few hours or days, so you'd need something less permeable.

How about attaching a helium or hydrogen filled weather balloon to your kayak? It would be hugely wind affected and make steering much harder. Build up those arm muscles!
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Old 05-30-2020, 01:50 PM
 
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What about filling two beach balls with helium and wedging one each into the stern and bow?
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Old 05-30-2020, 01:59 PM
 
Location: God's Gift to Mankind for flying anything
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Hmmm ... to those, suggesting helium-filled whatever ...

Think of when you were a little tike, and you got to hold a helium-filled balloon...

How much effort was it to hold on that bugger?

Got it? Now, how big should that whatever be to increase a sufficient force upwards to raise that kayak out of the water?

Back to "get a bigger kayak" (Listen to thecoalman - post #2 - there is only 1 answer!!)
Or better ... Get a fishing boat ... with an outboard engine ... or a luxury yacht ...
Attached Thumbnails
Adding buoyancy to kayak-toosmallboat.jpg  

Last edited by irman; 05-30-2020 at 02:19 PM..
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Old 05-30-2020, 02:33 PM
 
9,052 posts, read 5,168,999 times
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Quote:
Originally Posted by irman View Post
Hmmm ... to those, suggesting helium-filled whatever ...

Think of when you were a little tike, and you got to hold a helium-filled balloon...

How much effort was it to hold on that bugger?

Got it? Now, how big should that whatever be to increase a sufficient force upwards to raise that kayak out of the water?

Back to "get a bigger kayak" (Listen to thecoalman - post #2 - there is only 1 answer!!)
Or better ... Get a fishing boat ... with an outboard engine ... or a luxury yacht ...
It was sufficient to "float" dirigibles, and THEY had to weight a lot (at least the gondola and passengers it carried), or is hydrogen more powerful? Yes, I know the Hindenburg exploded, but that's another issue...
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Old 05-31-2020, 01:07 AM
 
Location: Eugene, Oregon
10,611 posts, read 3,760,135 times
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Quote:
Originally Posted by otterhere View Post
So adding pool noodles, say, along the length of the floor of the kayak (inside), wouldn't buoy it up in the water?

That would be the equivalent to standing in a box and trying to lift yourself off the floor, by pulling up on the sides.
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